It is a cute saying. I never heard of it, but I spent my early childhood in Europe.
It is not that fruits and vegetables do not taste as they used to taste here. Here, they never tasted as good as the fruits and vegetables of my childhood in Europe. When my husband and I went back for the summer of 1965, we could not believe how good everything tasted, even if it did not look as good as the fruit does here.
Buying fruits and vegetables is not much fun. While the fruit may be huge and beautiful, to start with it comes with a label glued to it and when I remove it, part of the skin comes off with it. That does not look nice in the fruit bowl. The fruit itself, as big and beautiful as it may look, does not have the flavor I expect. It is picked days or even weeks before it reaches my fruit store and has been treated with lots of chemicals, so it does not rot but does not taste good, either. It is the same with such vegetables like cucumbers, that come with a coat of wax or oil and do not taste as cucumbers that are freshly picked, do.
I also have a great tasting, half eaten cantaloupe right now waiting to be finished tonight. That is, if I do not eat it for lunch. :o)